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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cacc2e9e29ea65cc467e0d2ad49615837a6b72b0b03f040bf34eda79cdc6a54d' 
  AND token = 'fwsrqgV8mjgSOxrqQKoGFD4rmCNNMZNMZ6u38Y8Tk58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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