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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c79789fc7329afeae18d36d42456d3a3f93be50b3f5af5b8ad9fd52c24ed9e8f' 
  AND token = 'JwsLBJhHueimSv/2G6zCkmWuNp7Kf57H9Qab26kTMMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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