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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9cc7d4d8eed867d1bcc787011858053a44c2c3057a49cbad2c79efda1543903b' 
  AND token = 'EorjAeVqZZLzqpK4dRbknXWf+xYWlcAHO3uluYSO+3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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