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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0b5ac6378494141213be80d0cb6d4b043e7316e0e3ba75886d301cffe4583311' 
  AND token = 'DDQ3KP4+X/mjKWd4EsEugmZ8uNxj0AfxHhcFzpEJ32Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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