Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15cb0ae839e571034c4e86d50182b5c3cd063b7e76a96d1b710af3e7e399d563' 
  AND token = '4+nf3KbmebBPB24Y7qiYW/9tCCVcZXMwBXr/Cax63p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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