Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a26874a8b8bb5dbfa0ac2b9871675a985cb1c1c971c568f5a03e00a03b6331' 
  AND token = 'jMor7Evfx6oyzcprQ5XvARWhDl0vzZ4K5TXWVGjVo6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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