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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7173bf4bf16007c412ab81d286cba49fdb95c7d1be69b689e5fe354ac836c771' 
  AND token = '2Ak+OfOnp+kxhvWsROlQjhyjCrxNlB2UmiS75kRtlFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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