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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a4283c6f19f534c5b039aaa7179e81784d9de94708766acee77d9c52b3a91ac3' 
  AND token = 'Oh0s68Y9vZ9UghOEYn6qS77U0KbUcHdOkpSMDJQxSmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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