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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bda63c0dfd84b84710efbda3c9a5b9820aa8e4da0142ee51f7a0e590302dcbcd' 
  AND token = 'JMRHySXo2vAeh0Ty1xH4SK6TWQjoElo3/oTrNgQxztE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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