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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'abc9adacf28192adc3885c86fbca5800c01b58bd62b0aaa2bcb63dc93076f1df' 
  AND token = 'vr4Diq1WosRVW7YsMIzAgUneNlbLQx33CHpC8WTB8J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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