SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f14c15f82a8d32c7624360cadfb785ec05bed928df90856e374b26d5bb97807b' 
  AND token = 'HAq9bynYTad5H955L1A4RT2wsSr9v3a/GZsRtf0PzKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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