Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a394aa33fa010db44733fb649ff316655e879bf961b604a18deaf5e4355726b' 
  AND token = 'ViJ3eCZtWUvnzsObc07lKudRNXo6s66XxIg7jM+ywmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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