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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '31d83e3374ab54ef5195d68393ae2fb534a04c0e13fa0a9e2bd274fd9f163a6f' 
  AND token = 'KskU5ReAO7ugwR7G4GudbnXaB+XZtGznpcXMXn8GVZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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