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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '08d92731b04256c813972ad73c3c7843aa2236285ebf95e084158d13cbba26ff' 
  AND token = 'ubMeOvCa/RT8XLU6rktpno29/l83yZFtcRIHPFJRVlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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