Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1f954e9e7c95e52cf32f38fed0287d5362a349272016d22ec33b0ed8d4d953' 
  AND token = 'DkqXgZqKBF3NF6HCK0Oz4Ze0xW6F1RNlIc5Uj9NNDv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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