Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666432908aa66c4b63046c92979149744ffe20c93aa119742f6c9ec485dce262' 
  AND token = '6ppvqU8cuZNAxTjlR3adNkjiRelAGk1ScPQLAfol1E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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