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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3892e56f2367d08d81fd45956378cb9ac3afe5de2eae9fd5b5ddb182645a0f45' 
  AND token = 'a98zlwGYC1u6oihXD1K5kz32gxUbjz3Lpp6ac3wAYh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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