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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e2ca1af31e667311625924d2e09ba8c670bf312523bc641808a7f4032d817409' 
  AND token = 'vZQIUa63DzdcBl/suzr2ihSg1ROSpPZiELDBEpzMBnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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