SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e3e220a1bc401b26bf2cc2dfc5798b3b6d8ee276171a586119e0e9d65085cdd' 
  AND token = 'vvVBf+1M7R2S8F9tCIqBILWgX/kYy4HOJUANHw5caj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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