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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7c09a0a18156ab4bf1dc3f7262dae17f310032d78525a8debf26883d7d7744ee' 
  AND token = 'rjePo+I4zV7aHbnDCN5tOxgSotO18m/XH0+xLKSV5SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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