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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '88fc87db4ad7c46d78dbeefc86dbd88fd8a559f7d5d217e6c52c5489f79001e2' 
  AND token = 'PCg+5OtY6Wp3iH9IOJwQfqCD+TcXMlz8FgIUfwwo9Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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