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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '19ef9fa6c26d9469607f3e36b03aed15e2171eff122dcea0c6edc62a65bd885e' 
  AND token = 'OlNYdl69o97DRtoffzvKHOI8YXi8dFH08M3ZdnxaI7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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