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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4a8002db05c636cab9a5b7e8c0a8bc26c8146909a77ffe8c58d53032d1bda7eb' 
  AND token = 'KBIHZi5xcBmfcL08gWwi2034f2bZg1vKB2WeQbBQ9fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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