Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7242ef7acd1e8c0ca511ed2d27198cd7aa1da9793ffbb6f84454974efff67840' 
  AND token = 'Hi/+1YMkcs0tQ/jdBOOcItv6j7XCUAhGxbOwCkEKd5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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