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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c4e965c5ca0f2acfdae3b1b5242dcc4210972151872d76874f35d61c74437905' 
  AND token = 'SmHdIRrGWqwiUKI/igWaFgoT+N+vu3Pix03f2cvVuMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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