Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f4422179c0f997f202a4dca45884a740026db29b986dd945e37227297bb9b8' 
  AND token = 'fFLarM3FzFt+nC/tN9Z2NbcRiDsg1VcEH/1qLIpKmjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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