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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '09a0581381f5102f32e319d14988d12c3f7cf43a6aca2c02cd80fb9f15228e13' 
  AND token = 'x49c34bOQAJDtQ9E//W03B4251Lv+A1C788L59rBlGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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