Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d0562189a2cc105d6bf6731ceeb58e90e5eb789aee0bcf55661096cdf3a9d0' 
  AND token = 'jZfB2dduqAMJh4QYLuVYXwGib2wstJxLXuCsZ6Q1auM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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