Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7781954183668e10886692138b79763abc77437573f58d3b193f523d2b3606' 
  AND token = '5I/4rIh37kYuvB36YQR11XiDnprOxCGrjLpMG7I541g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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