Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b21874748c81d2910a0e0209dd996cc3bdbb451ce98af8f0596a9a7275ff05a' 
  AND token = 'WwV3P+i7758TEUFKaGa3Y3ZkjYnnZ0mTM14lNbL3FO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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