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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e1b657983ed74790d90483d6aa25a43af0de7632fc8c4c49559b91f13b9e5d2a' 
  AND token = 'gUPMkX5VFj250nGx0S0Lt353bwrpavd5IACF9aBZdE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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