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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e1dcac76d214347f59a5e3fe015d7b613a58f2f372d3981e4fcdd7cba0f2f2d9' 
  AND token = 'r/0sYK+TiuDZtf1igmr7TKKWVZC9Iy+W2MriyVskOnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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