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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4d5bb45f446de5e620cbc251fbd849e17d3d0fc65b9862f90e42bc8cbac613d0' 
  AND token = 'cfE84Yp8W5i8dy8U+8tSXL6wztF4ICB369lk539aEyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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