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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d86df50062a1a9d25406b846f98f984bd0d5ee4bf21127f6094f5fc0d1e5cc7' 
  AND token = 'NOQVFi0lZ4CFRqej43Gafrm4zQklJ8mDn9mUj/yyVOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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