Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b64b3948614242346a2bb3ff56320d3752a95cb4dacaf0d8c9baf1213ad3531' 
  AND token = '3c07XVzlVATzS9GqGsOg1TSrNYCWJJkdgDNSeScyt8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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