Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cfeb40a1b3735232d0dee699533f5c57ed2afcd1d6b19c2ca3a61cd1549dcf9' 
  AND token = 'znU2DVa44/6/1Yl9Is+Cr4nUVlIgC6bxRss8s0Bezi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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