Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a0e27bd00d97586959df5c95c9eb4cdb5c9b0a9b4a4acf9a33e4e784fd347b' 
  AND token = 'G7OY9nYMXtumD59eo7oBAjHT9LFwzu/Uq5SkRj1zya4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}