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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98bbab79b6934cbd2a07e413d4651061dc78a6bb5d60e6de09a9a1033acd5163' 
  AND token = '4IQRi7usHXCH9dsbIEn0PUEdtJQmKdgLSumtYncSm0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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