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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ca223b9c216f5690c1ecced3fa54aeaf7d991abd1a9eced33cb8250d1ccfb2e0' 
  AND token = 'RF3093pGuqHKH89ay6/dWlQnC9r6ZGhGUEgejJReQkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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