Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd5231c4d9524e368ddb0895e7b561036ef012eb9a0b67623e72718de0842a1' 
  AND token = 'MzwsotPr657hpEsnipVf32BR6vlx5tatupGXgNU/48E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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