Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d1dee71bead12af30fa10ee766f3e53c56ac54fef92d4defd102fb670aea6a' 
  AND token = 'ZBcyAhgSs+QIv4Ob4J6JM8aihl9ay5ZNkyefvRtc1LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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