Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e6ea855e2ec652d5e93aabd83f3266db6efeb5755eca7a9f9701d812fcb66c' 
  AND token = 'iMoKF7BJgI0LBRZIiqju8i1MJ0W/eHro5J04Guc0Y9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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