Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b20ee75039567514f20daeb9707c734681f9d8b99f4ba58e54aa69bf8c87ef' 
  AND token = '2DjtDsYwHyvA+eKnKwOlT1tXWYo7+nPWLVdd06VEnUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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