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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd943d809362372a073d8613f3c9296eb0cd28ab3111c9e4ec69c7bdbbe017330' 
  AND token = 'd38fwH1BNWySnu1snSpQmh9WrWQ/b2OrHfc4Dqy3YAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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