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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ea680722c291d1c6ec6a004cc5cb90d8688951287d039ff73c469fba073ee30' 
  AND token = 'peQM+37bUuPcyQev/7G71oDpdY7TPlupP9VYTx7/24c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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