Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55451a522ef53a405f7ef7122a4f8626ec51be9df8c9f6d1d1f9b1d8eaff4de1' 
  AND token = 'ln2CWGcQIMtQa6t5polp4QC7c+9YBFYvPZ0rZjozrOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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