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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bd571214303fff7d330d8a0bbebd175e700f920043f69f3c69381eab275beec5' 
  AND token = 'rHn9m+AihqzfjpbGipDD40qwqXLehgjcXPcdzjmS0Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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