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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd95460c59de993aaf2f2c3d7f9dc90a18e8aa0147cba6708e4147dcca6eeca2c' 
  AND token = '1E8jOSj6to8Yq+U/h0PTYHMayR4Xxu5N+MYs+DlfRRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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