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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '34f003f4d9bf8bbb0b7735eb3841aca10877128b5323361793259e0fcfa7bd47' 
  AND token = 'ODk0Ps6G/TDbSNk4ZjqHDgDF8Y3WmGYxEkfBx0ZjDxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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