Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e0b5f8cd0e0beadf64621a42e9553cf88b2db4485ec2675b54538bfa084ce7' 
  AND token = 'BOXO1q0YVF1Sw7h7alMATtK0wSJdlEVBSxAXHnLcMsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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