Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739b235f019f5f46c39d27a6c83f08fe43e43f01690916739e4fcf8466c03314' 
  AND token = '2l035OESmoILfu6/EuLoYSHB5p0yCDAbzjaAMaeuFkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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