Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3533c1c6bad91952ae720357fac0e73090120685468ee80700af649ce00ba7' 
  AND token = 'YYO+A4jZc37oV9Vv8u/2ZbsYVUW212AdvKXDcfDnDI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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