Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0f46d0c6f988da97f72d1e227f3a0d503fd4ef057dc62a5204c70480b0c407' 
  AND token = 'm17JTYjRxK2y8ZMh6PT011fo7wvm7zfoBFZ3zs8Nz+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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