Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6712f76efccd52ebaa52b8d59967a7e0ab306639ece861c5b42fd0a19f11bf4c' 
  AND token = '3qZiVMBp+ymYDkLA/7jSS7WFwBIaAcLXPobvf67DFoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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