Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6dcc747df3456a562ea6def3467ae2f7969fae24e804188f57f714b2f51cddc' 
  AND token = 'a4AbRmJ+Bvqd32uv6SpIK+ZydS1HpPIkxXcvSqXpLRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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