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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e61bc2377a583c0d1934d12f69d1957424195f829c3c025db08951dd7eab60a7' 
  AND token = '3nLo74ktaXzJiEqZp6S4TkMlb6J0oXcDstJ01lqP1R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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