Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88dec710b8fd1d16fb9494164ed68bf0b68b8704c823504663f6172e70df87dc' 
  AND token = '9DiYK/bEfuNB4EijiMlAo66rTkFxLWBUnJnMwlmygfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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