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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '31241f21816f70620b5a7f4fbdc37478a648e2636d3de9786cf35aa6f258cc34' 
  AND token = 'aJaNusVf2EU6tmGd8bU5NpEvnX9E+aUAOXbfo9BPzV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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