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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4c03a8b4586bdad936dda92e0bd42b66fb72f535c27517dbb71dfd7de87d055f' 
  AND token = 'BjhPeLfehxVDI/rmihYyWiK7n2xJ+k70bwchD1EgbSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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