Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc75c7ebcb9ab85a00e224581f3293a317569ef35565d4f8b22d498be04a5159' 
  AND token = '1TEEwys/9nqqsy432heOeN3OJu9vfACBcb42zUjK1Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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