Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6277c3d50aec1b9eb440ee57bbf2610aabea2cf10ac876bfa349f3ae656a0590' 
  AND token = 'I2JCtV+UNeXlLnEB0B+QbFWYOqS4CU0OU5HZtLb89fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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