Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6218af911e1877372c4326edce308b4ed856378fc2525ff9002e456d57a44f3b' 
  AND token = '//X9dJ2tEFq609n6w8IMbq6SRZjapHUA3gWYPa0t2mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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