Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0bbcc924cef3933d8d4b4bf5575f7e42009ca0e82b5f6fb19d864baf4acbde' 
  AND token = '/in6OkA+1/JLU5Sw5wBkF7TvCbuj9L/BeBUHNt+ohp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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