Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a52de72edcb73549e615d8ed5d57a4d90acd14c4b2b2b17036e54bdb43eb9e' 
  AND token = 'IS3NeBqRQA2MIiYynvU+E5R6LB/yEEzu2SUTG4Ia63s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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