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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd2585d2b849fcef35b13f41f22b305e4cdd60138a8356355183a1ac0cbb1813b' 
  AND token = '6JTvdbcRhXpKHmEKVX/hn1sJA+AB2zryoFzs91DmFws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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