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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0236510f66f45f7c33961f087d1fddda5341f71c6f7e2b7974fb9003fcd6b335' 
  AND token = 'b7fmSqel8DzeqPT+g5c5v7++1my7haybjpogg86zeVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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