Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef48160d24d042fc549a33a76ef2a9f3c5d2ad81d3f6e72681783b7df6547b6' 
  AND token = 'y1EkTRaSBN3IbvK5ojnz/xzMTj4IvUl2y4OJ1vPqwQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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