Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667a7be6ee1ec1ecf39a95c70407221d422a1478ab37a78ff89c538696835783' 
  AND token = 'SCrSO+6JTavw81zQ9L8ck8psYwb1VdxBhAp80Vmnjlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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