Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc5734000c344b72de506fc98a3922b6e3580a0996436f08b84c2afa295d8bc' 
  AND token = 'MGN2jITvgotVpeX/AMrFr9LU3JJ2WVFtKOSoDkXuMM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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