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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a0de9e03ed6c297fc898d4ec06c4e00b3b8d29aaf6584b4c806c4c3cebf23a1f' 
  AND token = 'TbuyJedSjuMgknL7MeFuTGatBZKUp+kc4TcFXJaGAN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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