Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a8be4aa170f6ba3222d090d08b08621f9b1f3b04a791a3227e4a42d932ed72a' 
  AND token = '/bAuZpl6AbXrMseX7tN5jtc2Aw4bA2vU+W5p9WTCrBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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