Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376c7c8c469f1b377ee966dd0d4508dfdd8e5aa8f6cb5f0f0d258514e584468c' 
  AND token = 'ehDQyP3EFCtLDqBPWHRVV7MEx/RGFJgxESH0ja+WyLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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