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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c3377a7c0ead73682ec2ea0decd9704f3e91028ab43a75271b6fcd2772d12920' 
  AND token = 'f6mbuZpEghk6f6btZF01sbOnenw9ueG6EiEBaTrKfhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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